Take-up for sewing-machines.



F. F. DORSEY.

TAKE-UP FOB SEWING MACHINE.

uruoumn nun JULY 1a, 1904.

Patented my 25, 1909.

8 SHEETS-SHEET 1 P. F. DORS EY.

I TAKE-UP FOR SEWING MAUHINEB.

. APPLICATION FILED JUL: 18, 1904:

Patented May 25, 1909.

2 sums-sum a.

wms e UNITED sTATEs P rnNT OFFICE.

FARNUM F. DORSEY, 'OF WINCHESTER, MASSACHUSETTS, ASSIGNOR TO CAMPBELL- .BOSWOH'III MAUHINERY COMPANY, OF PORTLANDtMAINE, A CORPORATION OF MAINE.

TAKE-UP FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented May 25, 1909.

To all whom it may concern:

Be it known that I, FARNUM F. DORSEY, a citizen of the United States, residing at V'Vinchestcr, in the county of Middlesex and State of. Massachusetts, have invented certain new and usel'ullmprovements in Take- Ups for Sewing-Machines; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains'to make and use the same.

'lhe present invention relates to improvements 1n take-ups for sewing machines.

In sewing machines running at high speed it is necessary that vibratory or unbalanced movement of the parts be eliminated to the greatest practicable extent. Simplicity of the mechanism andvf'the avoidance of cam motions" are also important. For these rea sons it has been 'foundthat the ordinary vibrator or--fish-jpole" take-up which is commo y ,used on machines running at moderate s eeds, is unsatisfactory-on'highspeed mac es, 'for'not only doe's i'ts unbalanced 'motion impart vibration to the machine, and'require the 'use of a cam which is noisy and wears rap1dly,-but its operation upon the thread is unce rtain,-0wing to the -fact thatit springs-at the extremity of its stroke renderm'g uncertain the setting of. the

stitch, which occurs at this point and requires great accuracy in the-operation of the take-up.

To avoid the disadvantagesof the vibratory tahe-up the rotary take-up was produced; i. c. a' take-up in which the threaddrawing truck or other instrumentalitv is mounted on a rotary member and travels in "'a circle.

This lorm of tahc-up may have a perfectly balanced motion and avoid the use of-c'ams; but the rotary take-up is subject, in common 'with take-ups of other forms, to

Icertain requirements in the handling of the thread, to whichthe rotarytake-u is not well adapted to conform, owing to t' is fixed character of the path ofthe l-noving thread truek. In high-speedsewing machines the time devoted to 'the'operation of the take-up extends through only a fractiomgf a rotation; of the main "shaft; in the machine iii-connection With which thn.. present invention illustrate1Laboutw'ifi of a rotation are as-' signed to tliis'ioperotion. ilfithereiore, I a

rotary take-upwere arranged in a trochoida shaft only of the path of motion of the movin thread truck could be utilized, and the ta e-up would have to be of unwieldy size in order to take up the requisite amount of thread. a

In order to, avoid making the take-tip of inconvenienhsize it has been roposed to arrange a rotary take-up to ma e two rotations to each rotation of the main shaft, and to provide means for preventing the take-up from acting upon the thread during alternate rotations. Such an arrangement permits the use of a balanced take-up of moder' ate size, since the available part of the ath of motion of the -moving' thread true is twice as great as in the case. of the single rotary take-up, but it is unsatisfactory for these reasons, among others, that it requires a high speed of'rotation-,,mvolving increased wear and the use'of gearing between the take-up and-the shaft, and that the provision for interrupting the operation of the take-up during alternate rotations in- ,vplyes the use of cams or other mechanism .i'nqnnsistent'with simplicity and smooth,

.baiancedoperation.

=1=It "s the object of'the'present invention to produces. take-up which will fulfil the essential conditions referred to without incurrin the disadvantages of previously propose constructions, and to this end the invention thread truck is actuated by an epioyeloidal gearingfthe term being used in its broadest 1561188, to define a mechanism comprising cooperating rotary members of which one or more has a motion of revolution in addition to its rotation, A take-up so constructed may be arran ed to move the thread truck ath of which the form may be varied wide y. according to the proportions and relative arrangement of the parts; and by selecting a ath of suitable form and locating the fixed t read guides at the proper points the take-up may be arranged to take up the thread in the required space of time. A take-up of this character need not be of i-eatfsize since the fixed thread guides may .e located close together adj acent to a point in the pathof the movingtruok at which its.

going and returning. movements are on intersectihg. or 'a' firoximattng lines, 8 that the m v1ng'- tru may :ltct try-the matest hgantage ULdiMVLD}? out this contemplates a take-up in which the movable the moving truck are rendered unnecessary, since the truok, after taking up the thread,

- returns and-passes between the fixed guides the pen Y which,

frame 7 of the in the opposite direction, thereby backing away from the thread. Since all parts of the epicycloidal gearing have motions solely ofrotation or revolution all parts maybe exactly balanced so that no vibration results,

however rapid the actuation of the take-up.

The invention is illustrated as embodied 1n a sewingqnachine or the described in ing a pllcati-onof Geor e E. Warren, filed Mare 16, 1903', Serial I o. 147,888, for im' rovementsln sewing machines, .to lay permission, referenc jfnay be had for a full description thereof. In the drawin sFigure' 1 is a plan view of the take-up an a portion of the sewingmach'in-e' to which it is applied. Fig. 2' is a vertical s'ection'of the same. Figs. 3 and 4 are diagrams illustrating the-operation of taking u I "The illiistrated embodiment of the inventionisjconstructed as follows p The moving thread truck 1, which constitutes a thread engaging device, is secured by means'of' an arm 2 to a pinion 3 journaled upon a crank 4 fixed to and rotated by the shaft 5' of the sewi g 3 engages an inte 'na' ea ...6 fiXed 111.. the

straight line along a diameter of'the internal gear: lfhe weight. of. thecr ank tan-d the inion v and thread truck; carried thereby are Eal'ancerl bya counterpoise 8,- and the weight i of the thread truck. and the'arm '2 are balanced upon thepinion 3- by making the-opposite side of the- 'inion heavier as shown 1n:

the section. In is way the rotary m0ve ments of the parts' are erfectly balanced,- and although the thread strai ht line no" "rapir the actuation oftthe take-up.

The thread truck 1 cooperates with a fixed thread" truck 9 and a thread lock 1.0 which are arranged adjacent-"to and on op osite sides of itsgpath offmo'tionso that the t read -truck 1 moves betw'een t]'1ese par-ts,.enoountering the thread which is stretched between: ;.-.tdiem and-drawing' t'out into a U form, as

shown in Figs. 3 and'4. 'As thetime' allotted 1 tothe operation of the taking up in the illustrated' machine embraces .75 of,a rotation of :the.shaft'9-and;.lock;10 are arranged to one .side -Qf1tl16 center of the'ayt-ake-up so that the "movi g: thread truck. shall consume 75 of a rotatlo a eist sre h aohinef The inion 1 aphi'iie'l The diameter of theinte'rnal gear is exactly twice that of the pinion, so that as the crank 4; is rotated by.

- the shaft the pinion will make one'rotation absolutely for each rotationof the shaft, and

i the thread truck 1 will reciprocate in Ia ...truck moves in "a VlbIZLtlOIl results however- I nconnteringpthe t ead... @911; I r v sthine ngeksherlt L i errsioirliatrmthe"gha afiean hnammmsia e w w ken quired to release the thread from the truck. During 285 of the rotation of the shaft the movement of the movable thread truck is thread and the gearing to prevent entanglement of the thread, and the stud 12 upon which the thread truck 1 is mounted projects upward through a slot in this plate. The fixed thread truck 9 is journaled on an overhangin arm 13 rising from a base platel t secure to the plate 1 1 by screws 15 engaging screws and moving the base plate slight y the position of the fixed thread truck may 'be-va-. ried and the exact amountof thread taken up may be regulated. Where-the time a1- .lotted to the operation of taking-up is greater idle. A plate 11 is interposed between, the" slots in the base plate. By loosenin the or less than the fixed thread truck and thread lock may be moved nearer-or farther from the center of the takerup, according asthe time is to be greater or less.

The present invention, though illustrated in connection with a articular forln pf sew ing machine, is app 'cable t0--1niuiywither forms; and the form of epicycloidal'gearing employed to actuate the movable truck may be Widely varied without departing fromthe invention.

.Althoughthe illustrated form the-in I vention is arranged to actuate 'the m'oving ath of a particulargform' thread truck in a and to take up t e thread in a specified length of time, the invention: is by Ire-means limlted by these characteristics, sincethe value largely depends upon the'fact that by slight changes .in-the proportions anda'rrangements of the parts not affecting. .the

simplicity andbalanced operation of=tl re:lde- -vioe, the th of :motiono'f the {moving thread trudic of operation ofthe device may be varied to ad'a t it for use in di-fie'rent:forms ofesewing Moreover, although the device :is

mac ines. ad-a ted to work-satisfactorily in hi h-sp'eed mac hincs when "rotated once for each act-nation of the'ineedle, it may,'if-. desired, be romay be varied'so'tha-t the-time 'ta two or moretimesso as to combine the ad rantages of the double-rotar" tak-up :with the 'advantag fespeculiar to te present. construction. 3 I Ila-vin described "the invention, hat

P. claimed 1s:+ A takempforsew ngmachmesthawing, w. -.nnb1'nat1on, a thread-engag ng.devic s.

mo :tble 'thread-en'gagi' device, and "e; cycloi-dal gearing -for*'r'- parting a cycloii al'-,

movement to' the latter scribed.

,1 si' lbs tantial-ly a de :12; taker-n p for sewing machinesghaving,

in combination, -an internalge'ar, ga iilnion rolling within the same, athre'ad-engaging device' carriedbythe-plnion d. a'= threa;d;-

seaweed we a in combination a thread-engaging device, a movable thread-engaging device, and epicycloidal gearing for actuating the latter in a straight line, substantially as described.

4:. A take-up for sewing machines having, in combination, a thread-engaging device, a

movable thread-engaging device, and bal anced epicycloidal gearing for imparting a vibrating movement to the latter, substantially as described.

5. A take-up for sewing machines having, in combination with the shaft of the sewing machine, a thread-enga ing device, a movable thread-engaging evice, and epicycloidal gearing for actuating-the movable thread-engaging device connected with the In testimony whereof I affix m'y signatlire,

in presence of two witnesses.

FARNUM F. DORSEY. Witnesses: I

HORACE VAN EVEREN, FRED O. FISH.

It is hereby certified that in Letters Patent No. 923,031, granted May 25, 1909, upon the application of Farnnm F. Dorsey, of Winchester, Massachusetts, for an improvement in Take-Ups for Sewing-Machines, an error appears in the printed specification requiring correction, as follows: In line 59, page 2, after the word shaf the words the truck should be inserted; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 27th day of July, A. 1)., 1909.

' c. 0. BILLINGS,

J cling Commissioner of Patents.

[SEAL] 

